C Programming Questions and Answers on Pointers and Arrays for Freshers
https://www.computersprofessor.com/2017/12/c-programming-questions-and-answers-on_15.html
1. What is the output of this C code?
#includevoid main()
{int a[3] = {1, 2, 3};
int *p = a;
printf("%p\t%p", p, a);
}
a) Same address is printed.
b) Different address is printed.
c) Compile time error
d) Nothing
b) Different address is printed.
c) Compile time error
d) Nothing
Answer: a
2. What is the output of this C code?
#includevoid main()
{char *s = "hello";
char *p = s;
printf("%p\t%p", p, s);
}
a) Different address is printed
b) Same address is printed
c) Run time error
d) Nothing
b) Same address is printed
c) Run time error
d) Nothing
Answer: b
3. What is the output of this C code?
#includevoid main()
{char *s= "hello";
char *p = s;
printf("%c\t%c", p[0], s[1]);
}
a) Run time error
b) h h
c) h e
d) h l
b) h h
c) h e
d) h l
Answer: c
4. What is the output of this C code?
#includevoid main()
{char *s= "hello";
char *p = s;
printf("%c\t%c", *(p + 3), s[1]);
}
a) h e
b) l l
c) l o
d) l e
b) l l
c) l o
d) l e
Answer: d
5. What is the output of this C code?
#includevoid main()
{char *s= "hello";
char *p = s;
printf("%c\t%c", 1[p], s[1]);
}
a) h h
b) Run time error
c) l l
d) e e
b) Run time error
c) l l
d) e e
Answer: d
6. What is the output of the code given below?
#includevoid foo( int[] );
int main()
{int ary[4] = {1, 2, 3, 4};
foo(ary);
printf("%d ", ary[0]);
}void foo(int p[4])
{int i = 10;
p = &i;
printf("%d ", p[0]);
}
a) 10 10
b) Compile time error
c) 10 1
d) Undefined behaviour
b) Compile time error
c) 10 1
d) Undefined behaviour
Answer: c
7. What is the output of the code given below?
#includeint main()
{int ary[4] = {1, 2, 3, 4};
int *p = ary + 3;
printf("%d\n", p[-2]);
}
a) 1
b) 2
c) Compile time error
d) Some garbage value
b) 2
c) Compile time error
d) Some garbage value
Answer: b
8. What is the output of the code given below?
#includeint main()
{int ary[4] = {1, 2, 3, 4};
int *p = ary + 3;
printf("%d %d\n", p[-2], ary[*p]);
}
a) 2 3
b) Compile time error
c) 2 4
d) 2 somegarbagevalue
b) Compile time error
c) 2 4
d) 2 somegarbagevalue
Answer: d
9. What is the output of this C code?
#includeint main()
{int ary[4] = {1, 2, 3, 4};
printf("%d\n", *ary);
}
a) 1
b) Compile time error
c) Some garbage value
d) Undefined variable
b) Compile time error
c) Some garbage value
d) Undefined variable
Answer: a
10. What is the output of this C code?
#includeint main()
{const int ary[4] = {1, 2, 3, 4};
int *p;
p = ary + 3;
*p = 5;
printf("%d\n", ary[3]);
}
a) 4
b) 5
c) Compile time error
d) 3
b) 5
c) Compile time error
d) 3
Answer: b
11. Different ways to initialize an array with all elements as zero are
a) int array[5] = {};
b) int array[5] = {0};
c) int a = 0, b = 0, c = 0;
int array[5] = {a, b, c};
d) All of the mentioned
Answer: d
12. The elements in the array of the following code are
int array[5] = {5};
int array[5] = {5};
a) 5, 5, 5, 5, 5
b) 5, 0, 0, 0, 0
c) 5, (garbage), (garbage), (garbage), (garbage)
d) (garbage), (garbage), (garbage), (garbage), 5
Answer: b
13. Which of the following declaration is illegal?
a) int a = 0, b = 1, c = 2;
int array[3] = {a, b, c};
b) int size = 3;
int array[size];
c) int size = 3;
int array[size] = {1, 2, 3};
d) All of the mentioned
Answer: c
14. An array of similar data types which themselves are collection of dissimilar data type are
a) Linked Lists
b) Trees
c) Array of Structure
d) All of the mentioned
Answer: c
15. Comment on an array of void data type:
a) It can store any data-type
b) It only stores element of similar data type to first element
c) It acquires the data type with the highest precision in it
d) You cannot have an array of void data type
Answer: d
16. What is the output of the code given below?
#includeint main()
{int ary[4] = {1, 2, 3, 4};
int p[4];
p = ary;
printf("%d\n", p[1]);
}
a) 1
b) Compile time error
c) Undefined behaviour
d) 2
b) Compile time error
c) Undefined behaviour
d) 2
Answer: b
